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diff --git a/compiler/utils/FastString.lhs b/compiler/utils/FastString.lhs
index 5b9c7f9..ca7c2c7 100644
--- a/compiler/utils/FastString.lhs
+++ b/compiler/utils/FastString.lhs
@@ -2,6 +2,13 @@
 % (c) The University of Glasgow, 1997-2006
 %
 \begin{code}
+{-# OPTIONS -w #-}
+-- The above warning supression flag is a temporary kludge.
+-- While working on this module you are encouraged to remove it and fix
+-- any warnings in the module. See
+--     http://hackage.haskell.org/trac/ghc/wiki/Commentary/CodingStyle#Warnings
+-- for details
+
 {-
 FastString:	A compact, hash-consed, representation of character strings.
 		Comparison is O(1), and you can get a Unique from them.